<template>
    <div>
    <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片 -->
        <el-card>
            <!-- 提示区 -->
             <el-alert  title="消息提示的文案" type="info" center show-icon :closable="false">
            </el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeindex - 0 " finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏 -->
            <el-form :model="addForm" :rules="addrules"
             ref="addRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeindex"  :tab-position="'left'" 
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="cateList"
                                :props="cascaderProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manytable" :key="item.attr_id"> 
                             <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                         <!-- action图片要上传到的APT地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture" :headers="headerobj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnadd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="PreviewdialogVisible"
            width="50%"
           >
           <img :src="PreviewPath" alt="">

        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default{
    
    data(){
        return{
            // 共用的数据 e-tabs和el-steps
            activeindex:'0',
            // 
            addForm:{
                goods_name:'',
                goods_price:'',
                goods_weight:'',
                goods_number:'',
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品详情描述
                goods_introduce:'',
                attrs:[]
            },
            // 
            addrules:{
                goods_name:[
                    {required:true,message:'请输入商品名',
                    trigger:'blur'}
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',
                    trigger:'blur'}
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',
                    trigger:'blur'}
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',
                    trigger:'blur'}],
                goods_cat:[
                    {required:true,message:'请选择商品分类',
                    trigger:'blur'}]
            },
            cateList:[],
            // 级联配置对象
            cascaderProps:{
                expandTrigger:'hover',
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manytable:[],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传图片的URL
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的请求头对象
            headerobj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            PreviewPath:'',
            PreviewdialogVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取商品分类数据
        async getCateList(){
             const {data:res} = await this.$http.get('categories') 
        
            if (res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            // console.log(res.data);
            // 赋值
            this.cateList = res.data
          
        },
        // 级联选择器选中项变化，触发这个函数
        handleChange(){
            // 级联选择器的选择范围
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
            console.log(this.addForm.goods_cat);
        },
        beforeTabLeave(activeName,oldActiveName){
             if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                 this.$message.error('请选择商品分类')
                   //阻止跳转
                  return false
             }
        },
       async tabClicked(){
            if(this.activeindex === '1'){
              const{data:res} = await this.$http.get(`categories/${this.cateID}/attributes`,{
                     params:{sel:'many'}
                 })
            if(res.meta.status !== 200){
                return this.$message.error('获取失败')
            }
            // console.log(res.data);
            this.$message.success('获取成功')
            // 将字符串 变为数组
            res.data.forEach(item => {
               item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
            this.manytable =res.data
            }else if(this.activeindex === '2'){
               const {data:res} = await this.$http.get(`categories/${this.cateID}/attributes`,{
                     params:{sel:'only'}
                 }) 
                if(res.meta.status !== 200){
                     return this.$message.error('获取静态属性失败')
                }
                this.$message.success('获取成功')
                // console.log(res.data);
                this.onlyTableData = res.data
            }
           
        },
        // 处理图片预览效果
        handlePreview(file){
            // console.log(file)
            this.PreviewPath = file.response.data.url
            this.PreviewdialogVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // 获取要删除图片的临时路径
            const filepath =file.response.data.tmp_path
            // 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filepath)
            // 调用数组的splice方法，把图片信息对象,从pic数组中删除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            console.log(response)
            // 1.拼接一个图片信息对象
            const pic = {pic:response.data.tmp_path}
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(pic)
            console.log(this.addForm)
        },
        // 添加商品
        add(){
           this.$refs.addRef.validate(async valid =>{
               if(!valid){
                   return this.$message.error('请填写必要的表单项')
               }
            //    执行添加的业务逻辑
            // 深拷贝原对象 lodsh clone(obj)
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manytable.forEach(item =>{
                const newInfo ={
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
             this.onlyTableData.forEach(item =>{
                const newInfo ={
                    attr_id:item.attr_id,
                    attr_value:item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            // console.log(form);
            // 添加商品请求
            // 商品的名称，必须唯一
            const{data:res} = await this.$http.post('goods',form)

            if(res.meta.status !== 201){
                return this.$message.error('添加商品失败!')
            }
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
           })
        }
    },
    computed:{
        cateID(){
            if(this.addForm.goods_cat.length ===3 ){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}

</script>

<style lang="less" scoped>
 .el-checkbox{
     margin: 0 10px 0 0 !important;
 }
 
 .btnadd {
     margin-top: 15px;
 }
</style>